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Orion
Highfather
Lightray
Big Barda
Mister Miracle
Darkseid
Granny Goodness
Kalibak
Infinite-Man (no source backing)
Desaad
Steppenwolf

vs.

Thanos
Warrior
X
Omega
Armour
Mystic
Terraxia
Thanos Clone (the one that lost to Kazar and to Xman later on)
Thanos Clone (Celestial Madonna Arc)
Thanos Clone (Lost to Thor, with Chalice of Ruins)
Ultimate Thanos (earth 1610)

Omega wins.

Thanos loses.